Electric Current Flashcards

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1
Q

What is Electrical Potential Energy?

A

The ability to move an electric charge from one point to another.

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2
Q

What is Potential Difference?

A

The work need to move one unit charge to another point.

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3
Q

What is a Cell?

A

A source of electric current that works on potential difference.

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4
Q

What is Electric Current?

A

The rate at which electric charges move through a conductor.

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5
Q

What are the four types of Electric Cells?

A

Electrochemical, Photoelectric/Photovoltic, Thermoelectric, and Piezoeletric.

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6
Q

What are some common uses of Electrochemical Cells?

A

They’re commonly used for normal batteries and automobile batteries.

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7
Q

What are some common uses of Photoelectric/Photovoltaic Cells?

A

Artifical satellites, calculators, and streetlight.

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8
Q

What are some common uses of Thermoelectric Cells?

A

Thermostats for furnaces and ovens.

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9
Q

What are some common uses of Piezoelectric Cells?

A

Microphones and headsets, computer keyboards, and record cartridges.

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10
Q

How do Electrochemical Cells work?

A

Electrons are transferred between metals immersed in electrolyte.

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11
Q

How do Photoelectric/Photovoltaic Cells work?

A

Electrons are released from a metal when struck by light of a sufficient energy.

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12
Q

How do Thermoelectric Cells work?

A

Two different metals are joined and they each have different-temperatured junctions, so electrons flow.

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13
Q

How do Piezoelectric Cells work?

A

Opposite surfaces of certain crystals become electrically charged under pressure.

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14
Q

What is Conventional Current?

A

The movement of positive charge.

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15
Q

What are the SI Units for Voltage, Current, and Resistance?

A

Volts, Amps, and Ohms.

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16
Q

What is the formula for Voltage?

A

V=RI

17
Q

What is the formula for Resistance?

A

R=V/I

18
Q

What is the formula for Current?

A

I=V/R

19
Q

What has more resistance, a Conductor or an Insulator?

A

An insulator.

20
Q

What is a Superconductor?

A

A certain metal whose resistance becomes zero at very low temperature.

21
Q

What is Voltage?

A

The causing of charges to move, which produces a current.